KR20230105714A - Display device - Google Patents

Abstract

A display device includes a display panel including a plurality of pixels, wherein one of the pixels includes a light emitting element connected to a first reference node and configured to generate light, a driving transistor connected between a power line configured to receive a power voltage and the first reference node, a scan transistor connected between a data line configured to receive a data signal and the driving transistor and configured to receive a scan signal, a first capacitor connected between the first reference node and a second reference node, and a shared transistor connected between the first reference node and the second reference node and configured to receive a shared control signal, wherein the first capacitor and the shared transistor are connected in series between the first reference node and the second reference node, and wherein a control electrode of the driving transistor is connected to the second reference node. According to the present invention, it is possible to constantly maintain the amount of light emitted from the light emitting element regardless of a change in mobility of the transistor.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device for improving reliability of display quality.

Various display devices used in multimedia devices such as televisions, mobile phones, tablet computers, navigation devices, and game machines are being developed.

As the fields of use of these display devices diversify, the types of display panels for displaying images displayed on the display devices are also diversifying.

Recently, a display panel includes a light emitting display panel, and the light emitting display panel may include an organic light emitting display panel or a quantum dot light emitting display panel.

An object of the present invention is to provide a display device capable of maintaining reliability of display quality regardless of changes in transistor characteristics.

A display device according to an exemplary embodiment of the present invention includes a display panel including a plurality of pixels. One of the pixels includes a light emitting element connected to a first reference node and generating light, and a driving transistor connected between a power supply line receiving a power supply voltage and the first reference node. One of the pixels includes a scan transistor connected between a data line receiving a data signal and the driving transistor and receiving a scan signal. One of the pixels includes a first capacitor connected between the first reference node and a second reference node, and a sharing transistor connected between the first reference node and the second reference node and receiving a sharing control signal. do. The first capacitor and the sharing transistor are connected in series between the first reference node and the second reference node. A control electrode of the driving transistor is connected to the second reference node.

In one embodiment of the present invention, the one pixel further includes a second capacitor connected between the second reference node and a reference voltage line receiving a reference voltage.

In an embodiment of the present invention, the reference voltage may be a ground voltage.

In an embodiment of the present invention, the driving transistor includes a first electrode connected to the power line, a second electrode connected to the first reference node, and a control electrode connected to the second reference node. The scan transistor includes a first electrode connected to the data line, a second electrode connected to the first reference node, and a control electrode receiving the scan signal. The sharing transistor includes a first electrode connected to the first reference node, a second electrode connected to the first capacitor, and a control electrode receiving the sharing control signal.

In an embodiment of the present invention, the first capacitor includes a first electrode connected to the second electrode of the sharing transistor and a second electrode connected to the second reference node. The second capacitor includes a first electrode connected to the second reference node and a second electrode connected to the reference voltage line.

In one embodiment of the present invention, the one pixel further includes a compensation transistor connected between the driving transistor and the second reference node. The compensation transistor includes a first electrode connected to the driving transistor, a second electrode connected to the second reference node, and a control electrode receiving a compensation scan signal.

In one embodiment of the present invention, the one pixel further includes a first initialization transistor connected between a first initialization line receiving a first initialization voltage and the first reference node. The first initialization transistor includes a first electrode connected to the first reference node, a second electrode connected to the first initialization line, and a control electrode receiving a first initialization scan signal.

In one embodiment of the present invention, the one pixel further includes a second initialization transistor connected between a second initialization line receiving a second initialization voltage and the second reference node. The second initialization transistor includes a first electrode connected to the second reference node, a second electrode connected to the second initialization line, and a control electrode receiving a second initialization scan signal.

In one embodiment of the present invention, the one pixel further includes a light emission control transistor connected between the power line and the driving transistor. The emission control transistor includes a first electrode connected to the power line, a second electrode connected to the driving transistor, and a control electrode receiving an emission control signal.

In one embodiment of the present invention, the scan signal includes a scan period for turning on the scan transistor. The compensation scan signal includes a compensation period for turning on the compensation transistor. The scan period and the compensation period overlap within one frame.

In an embodiment of the present invention, the first initialization scan signal includes a first initialization period for turning on the first initialization transistor. The second initialization scan signal includes a second initialization period for turning on the second initialization transistor. Within the one frame, the second initialization period precedes the scan period and the compensation period, and the first initialization period lags behind the scan period and the compensation period.

In an embodiment of the present invention, the first initialization scan signal further includes a third initialization period for turning on the first initialization transistor. Within the one frame, the third initialization period precedes the scan period and the compensation period.

In an embodiment of the present invention, the sharing control signal includes a sharing period for turning on the sharing transistor. Within the one frame, the sharing period lags behind the first initialization period.

In one embodiment of the present invention, the emission control signal includes an emission period for turning on the emission control transistor. Within the one frame, the emission period lags behind the first initialization period.

In one embodiment of the present invention, in the one frame, the sharing section and the emission section overlap.

A display device according to an exemplary embodiment of the present invention includes a display panel including a plurality of pixels. One of the pixels includes a light emitting element connected to a first reference node and generating light, and a driving transistor connected between a power supply line receiving a power supply voltage and the first reference node. One of the pixels includes a scan transistor connected between a data line and the driving transistor and including a control electrode receiving a scan signal. One of the pixels includes a first capacitor connected between the first reference node and a second reference node and a sharing transistor connected between the first reference node and the second reference node and receiving a sharing control signal. include The scan signal includes a scan period for turning on each of the scan transistors and a first initialization period. A data signal is applied to the data line during the scan period, and a first initialization voltage is applied to the data line during the first initialization period. The first capacitor and the sharing transistor are connected in series between the first reference node and the second reference node. A control electrode of the driving transistor is connected to the second reference node.

In one embodiment of the present invention, the one pixel further includes a second capacitor connected between the second reference node and a reference voltage line receiving a reference voltage. The sharing transistor includes a first electrode connected to the first reference node, a second electrode connected to the first capacitor, and the control electrode. The first capacitor includes a first electrode connected to the second electrode of the sharing transistor and a second electrode connected to the second reference node. The second capacitor includes a first electrode connected to the second reference node and a second electrode connected to the reference voltage line.

In one embodiment of the present invention, the one pixel further includes a light emitting control transistor connected between the power line and the driving transistor. The emission control transistor includes a first electrode connected to the power line, a second electrode connected to the driving transistor, and a control electrode receiving an emission control signal. The sharing control signal includes a sharing period for turning on the sharing transistor. The emission control signal includes an emission period for turning on the emission control transistor. Within one frame, the scan period precedes the first initialization period, and the first initialization period precedes the sharing period and the emission period. Within the one frame, the sharing period and the emission period overlap.

In one embodiment of the present invention, the one pixel further includes a compensation transistor connected between the driving transistor and the second reference node. The compensation transistor includes a first electrode connected to the driving transistor, a second electrode connected to the second reference node, and a control electrode receiving a compensation scan signal. The compensation scan signal includes a compensation period for turning on the compensation transistor. Within the one frame, the compensation period precedes the first initialization period, and the compensation period and the scan period overlap.

In one embodiment of the present invention, the one pixel further includes an initialization transistor connected between an initialization line receiving a second initialization voltage and the second reference node. The initialization transistor includes a first electrode connected to the second reference node, a second electrode connected to the initialization line, and a control electrode receiving an initialization scan signal. The initialization scan signal includes a second initialization period for turning on the first initialization transistor. Within the one frame, the second initialization period precedes the compensation period and the scan period.

According to the present invention, reliability of display quality of a display device can be maintained regardless of a change in characteristics of a transistor for driving a light emitting device. Specifically, the amount of light emitted from the light emitting device can be maintained constant regardless of the change in the mobility of the transistor by determining the magnitude of the current flowing through the light emitting device in correspondence with the mobility of the transistor. In addition, the amount of light emitted from the light emitting device can be maintained constant regardless of the change in the threshold voltage of the transistor by determining the magnitude of the current flowing through the light emitting device regardless of the threshold voltage of the transistor.

1 is a perspective view of a display device according to an exemplary embodiment of the present invention.
2 is a block diagram of a display device according to an exemplary embodiment of the present invention.
3 is a circuit diagram of a pixel according to an embodiment of the present invention.
4A to 4D are circuit diagrams for explaining an operation of a pixel according to an exemplary embodiment of the present invention.
FIG. 5 is a waveform diagram of driving signals for driving the pixel shown in FIG. 3 .
6 is a circuit diagram of a pixel according to an embodiment of the present invention.
7 is circuit diagrams of a pixel according to an embodiment of the present invention.
FIG. 8 is a waveform diagram of driving signals for driving the pixel shown in FIG. 7 .

In this specification, when an element (or region, layer, section, etc.) is referred to as being “on,” “connected to,” or “coupled to” another element, it is directly placed/placed on the other element. It means that they can be connected/combined or a third component may be placed between them.

Like reference numerals designate like components. Also, in the drawings, the thickness, ratio, and dimensions of components are exaggerated for effective description of technical content. “And/or” includes any combination of one or more that the associated elements may define.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In addition, terms such as “below”, “lower side”, “above”, and “upper side” are used to describe the relationship between components shown in the drawings. The above terms are relative concepts and will be described based on the directions shown in the drawings.

Terms such as "include" or "have" are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but that one or more other features, numbers, or steps are present. However, it should be understood that it does not preclude the possibility of existence or addition of operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, terms such as terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined herein, interpreted as too idealistic or too formal. It shouldn't be.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a perspective view of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1 , the display device DD may be a device activated according to an electrical signal. 1 exemplarily illustrates that the display device DD is a smart phone. However, the present invention is not limited thereto, and the display device DD may be a large display device such as a television or a monitor, or a small or medium-sized display device such as a tablet, a laptop computer, a car navigation system, or a game machine. These are merely presented as examples and, of course, other types of display devices may be included as long as they do not deviate from the concept of the present invention.

The display device DD has a long side in a first direction DR1, a short side in a second direction DR2 crossing the first direction DR1, and has a quadrangular shape with rounded vertices. However, the shape of the display device DD is not limited thereto, and display devices DD of various shapes may be provided. The display device DD may display the image IM in the third direction DR3 on the display surface IS parallel to the first and second directions DR1 and DR2 respectively. The display surface IS on which the image IM is displayed may correspond to the front surface of the display device DD.

In this embodiment, the front (or upper surface) and the rear surface (or lower surface) of each member are defined based on the direction in which the image IM is displayed. The front surface and the rear surface oppose each other in the third direction DR3, and a normal direction of each of the front surface and the rear surface may be parallel to the third direction DR3.

The distance between the front and rear surfaces in the third direction DR3 may correspond to the thickness of the display device DD in the third direction DR3. Meanwhile, directions indicated by the first to third directions DR1 , DR2 , and DR3 may be converted into other directions as a relative concept.

The display surface IS of the display device DD may be divided into a transmissive area TA and a bezel area BZA. The transmission area TA may be an area where the image IM is displayed. The user views the image IM through the transmission area TA. In this embodiment, the transmission area TA is shown as a quadrangular shape with rounded vertices. However, this is shown as an example, and the transmission area TA may have various shapes, and is not limited to one embodiment.

The bezel area BZA is adjacent to the transmission area TA. The bezel area BZA may have a predetermined color. The bezel area BZA may surround the transmission area TA. Accordingly, the shape of the transmission area TA may be substantially defined by the bezel area BZA. However, this is shown as an example, and the bezel area BZA may be disposed adjacent to only one side of the transmission area TA or may be omitted. The display device DD according to an embodiment of the present invention may include various embodiments, and is not limited to any one embodiment.

The display device DD includes a window WM and an outer case EDC. The window WM may be made of a transparent material capable of emitting an image IM. For example, it may be made of glass, sapphire, plastic, or the like. The outer case EDC may be combined with the window WM to define the appearance of the display device DD. The outer case EDC absorbs an impact applied to the display device DD from the outside and prevents foreign substances/moisture from penetrating into the display device DD to protect components accommodated in the outer case EDC.

2 is a block diagram of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 2 , the display device DD may include a display panel DP, a controller CP, a source driving block SDB, a gate driving block GDB, and a voltage generating block VGB.

The display panel DP according to an exemplary embodiment of the present invention may be a light emitting display panel. For example, the display panel DP may be an organic light emitting display panel, an inorganic light emitting display panel, or a quantum dot light emitting display panel. The light emitting layer of the organic light emitting display panel may include an organic light emitting material. The light emitting layer of the inorganic light emitting display panel may include an inorganic light emitting material. The light emitting layer of the quantum dot light emitting display panel may include quantum dots and quantum rods. Hereinafter, in this embodiment, the display panel DP will be described as an organic light emitting display panel.

As an example of the present invention, the display panel DP includes a plurality of pixels PX, a plurality of scan lines SSL, a plurality of first initialization scan lines ISL1, and a plurality of second initialization scan lines ( ISL2), a plurality of sharing control lines (SCL), a plurality of compensation scan lines (CSL), a plurality of emission control lines (ECL), and a plurality of data lines (DL).

Scan lines SSL, first initialization scan lines ISL1, second initialization scan lines ISL2, sharing control lines SCL, compensation scan lines CSL, and emission control lines ECL Each extends from the gate driving block GDB in the second direction DR2 and is spaced apart from each other in the first direction DR1. The data lines DL extend from the source driving block SDB in a first direction DR1 and are spaced apart from each other in a second direction DR2.

Each of the pixels PX includes a corresponding one of the scan lines SSL, a corresponding one of the first initialization scan lines ISL1 , and second initialization scan lines ISL2 . a corresponding one of the second initialization scan lines, a corresponding one of the shared control lines (SCL), a corresponding one of the compensation scan lines (CSL), and a corresponding one of the emission control lines (ECL) is electrically connected to a corresponding one of the emission control lines. Also, each of the pixels PX is electrically connected to a corresponding one of the data lines DL. However, according to the configuration of the driving circuit of the pixels PX, the pixels PX, the scan lines SSL, the first initialization scan lines ISL1, the second initialization scan lines ISL2, and the sharing control A connection relationship between the lines SCL, the compensation scan lines CSL, the emission control lines ECL, and the data lines DL may be changed.

Each of the pixels PX may include a light emitting element ED (refer to FIG. 3 ) generating color light. For example, the pixels PX may include red pixels generating red color light, green pixels generating green color light, and blue pixels generating blue color light. A light emitting device of a red pixel, a light emitting device of a green pixel, and a light emitting device of a blue pixel may include light emitting layers of different materials. As an example of the present invention, each of the pixels PX may include white pixels generating white color light.

The controller CP receives an image signal RGB and a control signal CTRL from the outside. The controller CP converts the data format of the image signal RGB to meet the interface specification with the source driving block SDB to generate the image data IMD. The controller CP generates a source driving signal SDS, a gate control signal GDS, and a voltage control signal VCS based on the control signal CTRL. As an example of the present invention, the control signal CTRL may include a vertical sync signal, a horizontal sync signal, and a main clock.

The controller CP transmits the image data IMD and the source driving signal SDS to the source driving block SDB. The source driving signal SDS may include a horizontal start signal initiating an operation of the source driving block SDB. The source driving block SDB generates a data signal DS based on the image data IMD in response to the source driving signal SDS. The source driving block SDB outputs the data signal DS to a plurality of data lines DL. The data signal DS may be an analog voltage corresponding to the grayscale value of the image data IMD.

The controller CP transmits the voltage control signal VCS to the voltage generating block VGB. The voltage generation block VGB generates voltages necessary for the operation of the display panel DP based on the voltage control signal VCS. As an example of the present invention, the voltage generation block VGB generates a first power supply voltage ELVDD, a second power supply voltage ELVSS, a first initialization voltage Vinit1 and a second initialization voltage Vinit2. As an example of the present invention, the voltage level of the first power supply voltage ELVDD is higher than that of the second power supply voltage ELVSS. As an example of the present invention, the voltage level of the first power supply voltage ELVDD may be approximately 4V to 7V. The voltage level of the second power supply voltage ELVSS may be approximately 0V to -3V. The voltage level of the first initialization voltage Vinit1 may be approximately -3.5V to -5V. The voltage level of the second initialization voltage Vinit2 may be approximately -3.5V to -5V. As an example of the present invention, the first initialization voltage Vinit1 and the second initialization voltage Vinit2 may have the same voltage level. However, the present invention is not limited thereto, and the first voltage generation block VGB generates the first voltage according to the configuration of the driving circuit of the pixels PX or the characteristics of the light emitting element ED included in each of the pixels PX. Voltage levels of the power supply voltage ELVDD, the second power supply voltage ELVSS, the first initialization voltage Vinit1 and the second initialization voltage Vinit2 may be changed.

The voltage generation block VGB applies the first power voltage ELVDD, the second power voltage ELVSS, the first initialization voltage Vinit1 and the second initialization voltage Vinit2 to the display panel DP.

The controller CP transmits the gate control signal GDS to the gate driving block GDB. The gate driving block GDB generates a plurality of driving signals SS, ISS1, ISS2, SCS, CSS, and ECS based on the gate control signal GDS.

The driving signals SS, ISS1, ISS2, SCS, CSS, and ECS include a plurality of scan signals SS, a plurality of first initialization scan signals ISS1, a plurality of second initialization scan signals ISS2, It includes a plurality of sharing control signals (SCS), a plurality of compensation scan signals (CSS), and a plurality of emission control signals (ECS).

The gate driving block GDB outputs scan signals SS to scan lines SSL, respectively. The gate driving block GDB outputs the first initialization scan signals ISS1 to the first initialization scan lines ISL1, respectively. The gate driving block GDB outputs the second initialization scan signals ISS2 to the second initialization scan lines ISL2, respectively. The gate driving block GDB outputs the shared control signals SCS to the shared control lines SCL, respectively. The gate driving block GDB outputs the compensation scan signals CSS to the compensation scan lines CSL, respectively.

As an example of the present invention, the gate driving block GDB may be embedded in the display panel DP. That is, the gate driving block GDB may be directly formed on the display panel DP through a thin film process of forming the pixels PX on the display panel DP.

3 is a circuit diagram of a pixel according to an embodiment of the present invention.

Referring to FIGS. 2 and 3 , in FIG. 3 , among the plurality of pixels PX included in the display panel DP, a pixel PXij connected to the i th scan line SSLi and the j th data line DLj is Illustratively shown.

Referring to FIGS. 2 and 3 , each of the pixels PX includes a first power line RL1 , a second power line RL2 , a first initialization power line VIL1 , a second initialization power line VIL2 , and It is connected to the reference power line (VRL). The first power line RL1 receives the first power voltage ELVDD from the voltage generation block VGB. The second power line RL2 receives the second power voltage ELVSS from the voltage generation block VGB. The first initialization power line VIL1 receives the first initialization voltage Vinit1 from the voltage generation block VGB. The second initialization power supply line VIL2 receives the second initialization voltage Vinit2 from the voltage generation block VGB.

As an example of the present invention, the pixel PXij includes first to seventh transistors T1 to T7 , a first capacitor Cst1 , a second capacitor Cst2 , and a light emitting element ED. As an example of the present invention, the first to seventh transistors T1 to T7 may be provided as N-type (n-channel MOSFET). In addition, as an example of the present invention, some of the first to seventh transistors T1 to T7 may be provided as N-type (n-channel MOSFETs) and others may be provided as P-type (p-channel MOSFETs). . Specifically, among the first to seventh transistors T1 to T7, the third and fourth transistors T3 and T4 are N-type, and the remaining transistors T1, T2, T5, and T6 are P-type. may be provided. However, the present invention is not limited thereto, and among the first to seventh transistors T1 to T7, the first, third, and fourth transistors T1, T3, and T4 are provided as N-type, and the remaining transistors are It may be provided as a P type. In this embodiment, each of the first to seventh transistors T1 to T7 is described as being an N-type transistor.

As an example of the present invention, the first to seventh transistors T1 to T7 may be transistors having an oxide semiconductor layer. As an example of the present invention, the metal oxide semiconductor may include a crystalline or amorphous oxide semiconductor. For example, the oxide semiconductor is a metal oxide such as zinc (Zn), indium (In), gallium (Ga), tin (Sn), titanium (Ti), or zinc (Zn), indium (In), gallium (Ga) , tin (Sn), may include a mixture of metals such as titanium (Ti) and their oxides. Oxide semiconductors include indium-tin oxide (ITO), indium-gallium-zinc oxide (IGZO), zinc oxide (ZnO), indium-zinc oxide (IZnO), zinc-indium oxide (ZIO), indium oxide (InO), titanium oxide (TiO), indium-zinc-tin oxide (IZTO), zinc-tin oxide (ZTO), and the like. The present invention is not limited thereto, and at least one of the first to seventh transistors T1, T2, T3, T4, T5, T6, and T7 is a transistor having a low-temperature polycrystalline silicon semiconductor layer. and at least one of the first to seventh transistors T1 , T2 , T3 , T4 , T5 , T6 , and T7 may be a transistor having an oxide semiconductor layer. As an example of the present invention, the first transistor T1 is a transistor having an oxide semiconductor layer, and the second to seventh transistors T2, T3, T4, T5, T6, and T7 are transistors having a low-temperature polysilicon semiconductor layer. can

In this specification, "a transistor is connected to a signal line" means "one of the source electrode, drain electrode, and gate electrode of the transistor has an integral shape with the signal line or is connected through a connection electrode." . In addition, “a transistor is electrically connected to another transistor” means that “one of the source electrode, drain electrode, and gate electrode of a transistor is integrated with any one of the source electrode, drain electrode, and gate electrode of another transistor. It means “that which has the shape of or is connected through a connecting electrode.

Hereinafter, the first to seventh transistors T1 to T7 each include a first electrode, a second electrode, and a control electrode.

The first transistor T1 is connected between the first power line RL1 receiving the first power voltage ELVDD and the first reference node RN1. The first electrode EL1_1 of the first transistor T1 is electrically connected to the first power line RL1. The second electrode EL2_1 of the first transistor T1 is electrically connected to the first reference node RN1. The control electrode CE1 of the first transistor T1 is electrically connected to the second reference node RN2. Hereinafter, the first transistor T1 may be referred to as a driving transistor T1.

The second transistor T2 is connected between the j-th data line DLj and the driving transistor T1. The first electrode EL1_2 of the second transistor T2 is electrically connected to the j-th data line DLj. The second electrode EL2_2 of the second transistor T2 is electrically connected to the second electrode EL2_1 of the driving transistor T1. In this embodiment, the control electrode CE2 of the second transistor T2 is electrically connected to the i-th scan line SSLi. As an example of the present invention, the i-th scan signal SSi may be transferred to the control electrode CE2 of the second transistor T2 through the i-th scan line SSLi. The data signal DSj may be transmitted to the second electrode EL2_2 of the second transistor T2 through the j-th data line DLj. Hereinafter, the second transistor T2 may be referred to as a scan transistor T2.

The third transistor T3 is connected between the first reference node RN1 and the first capacitor Cst1. The first electrode EL1_3 of the third transistor T3 is electrically connected to the first reference node RN1, and the second electrode EL2_3 of the third transistor T3 is electrically connected to the first capacitor Cst1. Connected. The control electrode CE3 of the third transistor T3 is electrically connected to the i-th shared control line SCLi. As an example of the present invention, the i-th shared control signal SCSi may be transmitted to the control electrode CE3 of the third transistor T3 through the i-th shared control line SCLi. Hereinafter, the third transistor T3 may be referred to as a sharing control transistor T3.

A first capacitor Cst1 is connected between the first reference node RN1 and the second reference node RN2. Specifically, the first capacitor Cst1 is connected between the common control transistor T3 and the second reference node RN2. The first capacitor Cst1 includes a first electrode Cst1_1 connected to the second electrode EL2_3 of the common control transistor T3 and a second electrode Cst1_2 connected to the second reference node RN2.

The second capacitor Cst2 is connected between the second reference node RN2 and the reference voltage line VRL receiving the reference voltage. The second capacitor Cst2 includes a first electrode Cst2_1 connected to the second reference node RN2 and a second electrode Cst2_2 connected to the reference voltage line VRL. As an example of the present invention, the reference voltage may be a ground voltage.

The fourth transistor T4 is connected between the driving transistor T1 and the second reference node RN2. The first electrode EL1_4 of the fourth transistor T4 is electrically connected to the first electrode EL1_1 of the driving transistor T1. The second electrode EL2_4 of the fourth transistor T4 is electrically connected to the second reference node RN2. The control electrode CE4 of the fourth transistor T4 may be electrically connected to the i-th compensation scan line CSLi. As an example of the present invention, the i-th compensation scan signal CSSi may be transmitted to the control electrode CE4 of the fourth transistor T4 through the i-th compensation scan line CSLi. Hereinafter, the fourth transistor T4 may be referred to as a compensation transistor T4. In this embodiment, the compensating transistor T4 may include a plurality of gates. The compensation transistor T4 may reduce leakage current of the pixel PXij by having a plurality of gates.

The fifth transistor T5 is connected between the first initialization line VIL1 receiving the first initialization voltage Vinit1 and the first reference node RN1. The first electrode EL1_5 of the fifth transistor T5 is electrically connected to the first reference node RN1. The second electrode EL2_5 of the fifth transistor T5 is electrically connected to the first initialization line VIL1. The control electrode CE5 of the fifth transistor T5 may be electrically connected to the i-th first initialization scan line ISL1i. As an example of the present invention, the i-th first initialization scan signal ISS1i may be transmitted to the control electrode CE5 of the fifth transistor T5 through the i-th first initialization scan line ISL1i. Hereinafter, the fifth transistor T5 may be referred to as a first initialization transistor T5.

The sixth transistor T6 is connected between the second reference node RN2 and the second initialization line VIL2 receiving the second initialization voltage Vinit2. The first electrode EL1_6 of the sixth transistor T6 is electrically connected to the second reference node RN2. The second electrode EL2_6 of the sixth transistor T6 is electrically connected to the second initialization line VIL2. The control electrode CE6 of the sixth transistor T6 may be electrically connected to the i-th second initialization scan line ISL2i. As an example of the present invention, the i-th second initialization scan signal ISS2i may be transferred to the control electrode CE6 of the sixth transistor T6 through the i-th second initialization scan line ISL2i. Hereinafter, the sixth transistor T6 may be referred to as a second initialization transistor T6.

The seventh transistor T7 is connected between the first power line RL1 and the driving transistor T1. The first electrode EL1_7 of the seventh transistor T7 is electrically connected to the first power line RL1. The second electrode EL2_7 of the seventh transistor T7 is electrically connected to the first electrode EL1_1 of the driving transistor T1. The control electrode CE7 of the seventh transistor T7 may be electrically connected to the i-th emission control line ECLi. The i-th emission control signal ECSi may be transmitted to the control electrode CE7 of the seventh transistor T7 through the i-th emission control line ECLi. Hereinafter, the seventh transistor T7 may be referred to as an emission control transistor T7. As an example of the present invention, the i-th emission control signal ECSi provided to the i-th emission control line ECLi may be the same signal as the i-th shared control signal SCSi provided to the i-th shared control line SCLi. there is.

The light emitting element ED is connected between the first reference node RN1 and the second power line RL2 receiving the second power voltage ELVSS. The light emitting element ED receives the driving current I _ED flowing through the driving transistor T1 and emits light.

4A to 4D are circuit diagrams for explaining an operation of a pixel according to an exemplary embodiment of the present invention. FIG. 5 is a waveform diagram of driving signals for driving the pixel shown in FIG. 3 . Hereinafter, the same reference numerals are assigned to the same components and signals as those described in FIG. 3, and descriptions thereof will be omitted.

2 and 5, the gate driving block GDB includes scan signals SS, first initial scan signals ISS1, second initial scan signals ISS2, and sharing control signals SCS. , compensation scan signals CSS and emission control signals ECS are sequentially transmitted to the display panel DP. Scan signals SS, first initialization scan signals ISS1, second initialization scan signals ISS2, sharing control signals SCS, compensation scan signals CSS and emission control signals ECS Each may have a high level for some intervals and a low level for some intervals. At this time, the N-type transistors are turned on when the corresponding signal has a high level, and the P-type transistors are turned on when the corresponding signal has a low level. Hereinafter, a case in which the transistors T1 to T7 included in the pixel PXij are N-type will be described as an example in FIGS. 3 to 4D.

Referring to FIGS. 4A and 5 , when a period in which the ith second initialization scan signal ISS2i has a high level within one frame is referred to as a second initialization period ISW2, the second initialization period During (ISW2), the second initialization transistor T6 is turned on. When the second initialization transistor T6 is turned on, the second initialization voltage Vinit2 is transmitted to the second reference node RN2 through the second initialization transistor T6. Accordingly, the second reference node RN2 is initialized to the second initialization voltage Vinit2, and the control electrode CE1 of the driving transistor T1 electrically connected to the second reference node RN2 also has the second initialization voltage Vinit2. is initialized with

Within one frame (1 frame), the i-th first initialization scan signal ISS1i includes a first initialization period ISW1 and a third initialization period ISW3 having a high level. During the third initialization period ISW3, the first initialization transistor T5 is turned on. When the first initialization transistor T5 is turned on, the first initialization voltage Vinit1 is transmitted to the first reference node RN1 through the first initialization transistor T5. Accordingly, the first reference node RN1 is initialized to the first initialization voltage Vinit1, and the second electrode EL2_1 of the driving transistor T1 and the light emitting element ED are electrically connected to the first reference node RN1. The anode of is also initialized to the first initialization voltage Vinit1.

Referring to FIGS. 4B and 5 , within one frame (1 frame), the ith scan signal SSi includes a scan period SSW having a high level. During the scan period SSW, the scan transistor T2 is turned on. When the scan transistor T2 is turned on, the data signal DSj is transmitted to the first reference node RN1 through the scan transistor T2. Accordingly, the data signal DSj is transmitted to the second electrode EL2_1 of the driving transistor T1 electrically connected to the first reference node RN1.

Within one frame (1 frame), the i-th compensation scan signal CSSi includes a compensation period CSW having a high level. During the compensation period CSW, the compensation transistor T4 is turned on. When the compensation transistor T4 is turned on, the driving transistor T1 is diode-connected by the turned-on compensation transistor T4 and forward biased.

이 보상 트랜지스터(T4)를 통해 구동 트랜지스터(T1)의 제1 전극(EL1_1) 및 제어 전극(CE1)에 인가된다. 이때, 제2 커패시터(Cst2)의 양단에는 보상 전압

과 그라운드 전압이 인가되고, 제2 커패시터(Cst2)에는 양단의 전압차

에 대응하는 전하가 저장될 수 있다.As an example of the present invention, the scan period (SWW) and the compensation period (CSW) may overlap within one frame (1 frame). In this case, the compensation voltage reduced by the magnitude of the threshold voltage (Vth) of the driving transistor T1 from the potential included in the data signal DSj applied to the second electrode EL2_1 of the driving transistor T1.

The voltage is applied to the first electrode EL1_1 and the control electrode CE1 of the driving transistor T1 through the compensation transistor T4. At this time, a compensation voltage is applied to both ends of the second capacitor Cst2.

and ground voltage are applied, and the voltage difference between both ends is applied to the second capacitor Cst2.

A charge corresponding to may be stored.

As an example of the present invention, within one frame (1 frame), the second initialization period (ISW2) and the third initialization period (ISW3) may precede the scan period (SWW) and the compensation period (CSW), and the first initialization period (ISW1) may lag behind the scan period (SWW) and the compensation period (CSW).

Referring to FIGS. 4C and 5 , the first initialization transistor T5 is turned on during the first initialization period ISW1. When the first initialization transistor T5 is turned on, the first initialization voltage Vinit1 is transmitted to the first reference node RN1 through the first initialization transistor T5. Accordingly, the first initialization voltage Vinit1 may be applied to the first reference node RN1 to which the data signal DSj is supplied through the scan transistor T2.

Referring to FIGS. 4D and 5 , when a period in which the ith light emission control signal ECSi has a high level is referred to as an emission period ECW within one frame, emission control during the emission period ECW. Transistor T7 is turned on. When the emission control transistor T7 is turned on, the first power supply voltage ELVDD is applied to the first electrode EL1_1 of the driving transistor T1 through the emission control transistor T7. In this case, a driving current I _ED according to a difference between the potential of the first electrode EL1_1 of the driving transistor T1 and the potential of the control electrode CE1 is generated through the driving transistor T1. The driving current I _ED is transferred to the light emitting element ED through the driving transistor T1. The light emitting element ED emits light by receiving the driving current I _ED . At this time, the control electrode CE1 of the driving transistor T1 allows the driving transistor T1 to be turned on through the charge stored in the second capacitor Cst2 during the period in which the light emitting control transistor T7 is turned on. potential can be maintained. As an example of the present invention, the emission period ECW may lag behind the first initialization period ISW1 within one frame.

에 해당하는 전하가 분배된다. 따라서 제2 커패시터(Cst2)에는 보상 구간(CSW)에서 저장된 전하와 공유 구간(SCW)에서 분배된 전하가 더해진 합산 전하

가 저장된다. 구동 트랜지스터(T1)의 전류-전압 관계에 따르면, 구동 전류(I_ED)는 아래의 수학식 1과 같이 정의된다.In addition, when a period in which the ith sharing control signal SCSi has a high level within one frame is referred to as a sharing period SCW, during the sharing period SCW, the sharing control transistor T3 turns- come on Charges are accumulated on the first reference node RN1 by the driving current I _ED flowing through the turned-on light emitting control transistor T7 and the driving transistor T1. The potential of the first reference node RN1 at which charge is accumulated by the driving current I _ED is referred to as a light emitting voltage VOLED (not shown). When the sharing control transistor T3 is turned on, the charge accumulated in the first reference node RN1 is distributed by the first and second capacitors Cst1 and Cst2 connected in series, and the second reference node RN2 in

The charge corresponding to is distributed. Therefore, the sum of the charge stored in the compensation section CSW and the charge distributed in the sharing section SCW is added to the second capacitor Cst2.

is stored According to the current-voltage relationship of the driving transistor T1, the driving current I _ED is defined as in Equation 1 below.

[Equation 1]

Here, α is a constant corresponding to the area and length of the semiconductor layer included in the driving transistor T1, β represents the mobility characteristic of the driving transistor T1, and C1 is the capacitance of the first capacitor Cst1. (capacitance), C2 is the capacitance of the second capacitor Cst2, VOLED is the emission voltage, and DSj is the data signal. As an example of the present invention, the sharing period (SCW) within one frame (1 frame) may lag behind the first initialization period (ISW1). Within one frame, the sharing period (SCW) may overlap with the emission period (ECW).

At this time, when the mobility β of the driving transistor T1 increases, the magnitude of the current flowing through the driving transistor T1 increases, and accordingly, the amount of charge accumulated on the first reference node RN1 increases, thereby increasing the emission voltage VOLED. ) also increases in size. Accordingly, the size of the driving current (I _ED ) is reduced. On the other hand, when the mobility β of the driving transistor T1 decreases, the magnitude of the current flowing through the driving transistor T1 also decreases, and accordingly, the amount of charge accumulated on the first reference node RN1 decreases, thereby reducing the emission voltage. The size of (VOLED) also becomes smaller. Accordingly, the magnitude of the driving current (I _ED ) increases. Therefore, according to the present invention, the magnitude of the mobility β and the magnitude of the driving current I _ED of the driving transistor T1 are determined through negative feedback, so that the change in the mobility of the driving transistor T1 and Regardless, reliability of the display quality of the image (IM, see FIG. 1) displayed on the display panel (DP, see FIG. 2) can be maintained.

In addition, since the driving current (I _ED ) of the present invention is determined regardless of the threshold voltage (Vth) of the driving transistor T1, it is displayed on the display panel DP regardless of the threshold voltage (Vth) of the driving transistor T1. Reliability of the display quality of the image IM can be maintained.

6 is a circuit diagram of a pixel according to an embodiment of the present invention. Hereinafter, the same reference numerals are assigned to the same components and signals as those described with reference to FIGS. 3 to 5, and descriptions thereof will be omitted.

Referring to FIG. 6 , the first capacitor Cst1 is connected between the common control transistor T3 and the second reference node RN2. The first capacitor Cst1 includes a first electrode CSt1_1 connected to the second electrode EL2_3 of the common control transistor T3 and a second electrode Cst1_2 connected to the second reference node RN2.

The second capacitor Cst2_a is connected between the second reference node RN2 and the reference voltage line VRL_a receiving the reference voltage. As an example of the present invention, the reference voltage may be the first power supply voltage ELVDD. The second capacitor Cst2_a includes a first electrode Cst2_1a connected to the second reference node RN2 and a second electrode Cst2_2a connected to the reference voltage line VRL_a.

에 대응하는 전하가 저장될 수 있다. 또한, 발광 구간(ECW) 및 공유 구간(SCW)에서 제2 기준 노드(RN2)에는

에 해당하는 전하가 분배되고, 제2 커패시터(Cst2_a)는

에 해당하는 전하가 저장된다.Referring to FIGS. 5 and 6 , when the second capacitor Cst2_a is connected to the reference voltage line VRL_a receiving the first power voltage ELVDD, the second capacitor Cst2_a in the scan period SWW and the compensation period CSW The voltage difference between both ends of the capacitor (Cst2)

A charge corresponding to may be stored. In addition, in the emission period ECW and the sharing period SCW, the second reference node RN2 has

The charge corresponding to is distributed, and the second capacitor Cst2_a

The charge corresponding to is stored.

At this time, according to the current-voltage relationship of the driving transistor T1, the driving current I _ED is defined as in Equation 2 below.

[Equation 2]

Here, α is a constant corresponding to the area and length of the semiconductor layer included in the driving transistor T1, β represents the mobility characteristic of the driving transistor T1, and C1 is the capacitance of the first capacitor Cst1. (capacitance), C2 is the capacitance of the second capacitor Cst2_a, VOLED is the light emitting voltage, ELVDD is the first power supply voltage, and DSj is the data signal.

However, the present invention is not limited thereto, but the present invention is not limited thereto, and the reference voltage is any one of the second power supply voltage ELVSS, the first initialization voltage Vinit1 and the second initialization voltage Vinit2. It may be voltage. In this case, the magnitude of the charge stored in the second capacitor Cst2_a and the magnitude of the driving current I _ED may vary according to the type and corresponding magnitude of the reference voltage applied to the reference voltage line VRL_a.

7 is circuit diagrams of a pixel according to an embodiment of the present invention. FIG. 8 is a waveform diagram of driving signals for driving the pixel shown in FIG. 7 .

Referring to FIG. 7 , the pixel PXij includes first to sixth transistors T1_a to T6_a, a first capacitor Cst1_a, a second capacitor Cst2_a, and a light emitting element ED_a. In this embodiment, each of the first to sixth transistors T1_a to T6_a is described as being an N-type transistor. Hereinafter, each of the first to sixth transistors T1_a to T6_a includes a first electrode, a second electrode, and a control electrode.

The first transistor T1_a is connected between the first power line RL1_a receiving the first power voltage ELVDD and the first reference node RN1_a. The first electrode EL1_1a of the first transistor T1_a is electrically connected to the first power line RL1_a. The second electrode EL2_1_a of the first transistor T1_a is electrically connected to the first reference node RN1_a. The control electrode CE1_a of the first transistor T1_a is electrically connected to the second reference node RN2_a. Hereinafter, the first transistor T1_a may be referred to as a driving transistor T1_a.

The second transistor T2_a is connected between the j-th data line DLj_a and the driving transistor T1_a. The first electrode EL1_2a of the second transistor T2_a is electrically connected to the j-th data line DLj_a. The second electrode EL2_2a of the second transistor T2_a is electrically connected to the second electrode EL2_1a of the driving transistor T1_a. In this embodiment, the control electrode CE2_a of the second transistor T2_a is electrically connected to the i-th scan line SSLi_a to which the i-th scan signal SSi_a is applied. The data signal DSj may be transferred to the second electrode EL2_2a of the second transistor T2_a through the j-th data line DLj_a. Also, the first initialization signal Vinit1 may be transferred to the second electrode EL2_2a of the second transistor T2_a through the j-th data line DLj_a. An operation in which the data signal DSj or the first initialization signal Vinit1 is transferred to the second electrode EL2_2a of the second transistor T2_a through the j-th data line DLj_a will be described later with reference to FIG. 8 . . Hereinafter, the second transistor T2_a may be referred to as a scan transistor T2_a.

The third transistor T3_a is connected between the first reference node RN1_a and the first capacitor Cst1_a. The first electrode EL1_3a of the third transistor T3_a is electrically connected to the first reference node RN1_a, and the second electrode EL2_3a of the third transistor T3_a is electrically connected to the first capacitor Cst1_a. Connected. The control electrode CE3_a of the third transistor T3_a is electrically connected to the i-th shared control line SCLi_a to which the i-th shared control signal SCSi_a is applied. As an example of the present invention, the i-th shared control signal SCSi_a may be transmitted to the control electrode CE3_a of the third transistor T3_a through the i-th shared control line SCLi_a. Hereinafter, the third transistor T3_a may be referred to as a sharing control transistor T3_a.

The first capacitor Cst1_a is connected between the first reference node RN1_a and the second reference node RN2_a. Specifically, the first capacitor Cst1_a includes a first electrode Cst1_1a connected to the second electrode EL2_3a of the common control transistor T3_a and a second electrode Cst1_2a connected to the second reference node RN2_a. .

The second capacitor Cst2_b is connected between the second reference node RN2_a and the reference voltage line VRL_b receiving the reference voltage. The second capacitor Cst2_b includes a first electrode Cst2_1b connected to the second reference node RN2_a and a second electrode Cst2_2b connected to the reference voltage line VRL_b. As an example of the present invention, the reference voltage may be a ground voltage.

The fourth transistor T4_a is connected between the driving transistor T1_a and the second reference node RN2_a. The first electrode EL1_4a of the fourth transistor T4_a is electrically connected to the first electrode EL1_1a of the driving transistor T1_a. The second electrode EL2_4a of the fourth transistor T4_a is electrically connected to the second reference node RN2_a. The control electrode CE4_a of the fourth transistor T4_a may be electrically connected to the i-th compensation scan line CSLi_a to which the i-th compensation scan signal CSSi_a is applied. Hereinafter, the fourth transistor T4_a may be referred to as a compensation transistor T4_a. In this embodiment, the compensating transistor T4_a may include a plurality of gates. The compensation transistor T4_a may reduce leakage current of the pixel PXij by having a plurality of gates.

The fifth transistor T5_a is connected between the second reference node RN2_a and the initialization line VIL_a receiving the second initialization voltage Vinit2. The first electrode EL1_5a of the fifth transistor T5_a is electrically connected to the second reference node RN2_a. The second electrode EL2_5a of the fifth transistor T5_a is electrically connected to the initialization line VIL_a. The control electrode CE5_a of the fifth transistor T5_a may be electrically connected to the i th initial scan line ISLi_a to which the i th initial scan signal ISSi_a is applied. Hereinafter, the fifth transistor T5_a may be referred to as an initialization transistor T5_a.

The sixth transistor T6_a is connected between the first power line RL1_a and the driving transistor T1_a. The first electrode EL1_6a of the sixth transistor T6_a is electrically connected to the first power line RL1_a. The second electrode EL2_6a of the sixth transistor T6_a is electrically connected to the first electrode EL1_a1 of the driving transistor T1_a. The control electrode CE6_a of the sixth transistor T6_a may be electrically connected to the i-th emission control line ECLi_a to which the i-th emission control signal ECSi_a is applied. Hereinafter, the sixth transistor T6_a may be referred to as an emission control transistor T6_a. As an example of the present invention, the i-th emission control signal ECSi_a provided to the i-th emission control line ECLi_a may be the same signal as the i-th shared control signal SCSi_a provided to the i-th shared control line SCLi_a. there is.

The light emitting element ED_a is connected between the first reference node RN1_a and the second power line RL2_a receiving the second power voltage ELVSS. The light emitting element ED_a receives the driving current I _ED flowing through the driving transistor T1_a and emits light.

FIG. 8 shows signals for driving the pixel PXij shown in FIG. 7 . Hereinafter, a detailed description of the same operation as that of the pixel PXij described in FIGS. 4A to 5 will be omitted.

Referring to FIG. 8 , when a period in which the ith initialization scan signal ISSi_a has a high level within one frame is referred to as a second initialization period ISW2_a, an initialization transistor during the second initialization period ISW2_a. (T5_a) is turned on.

Within one frame (1 frame), the ith scan signal SSi_a includes a scan period SSW_a having a high level and a first initialization period ISW1_a. During the scan period SSW_a, the scan transistor T2_a is turned on. During a period overlapping the scan period SSW_a, the data signal DSj is applied to the j-th data line DLj_a. During the scan period SSW2_a, the data signal DSj is transferred to the first reference node RN1_a through the scan transistor T2_a. Accordingly, the data signal DSj is transmitted to the second electrode EL2_1a of the driving transistor T1_a electrically connected to the first reference node RN1_a.

As an example of the present invention, the data signal DSj is applied to the j-th data line DLj_a during the scan period SSW_a. During the first initialization period ISW1_a, the scan transistor T2_a is turned on. During a period overlapping the first initialization period ISW1_a, the first initialization voltage Vinit1 is applied to the j-th data line DLj_a. As an example of the present invention, the first initialization voltage Vinit1 is applied to the j-th data line DLj_a during the first initialization period ISW1_a. During the first initialization period SSW1_a, the first initialization voltage Vinit1 is transmitted to the first reference node RN1_a through the scan transistor T2_a. Accordingly, the first initialization voltage Vinit1 is applied to the second electrode EL2_1a of the driving transistor T1_a electrically connected to the first reference node RN1_a and the light emitting element ED_a.

Within one frame (1 frame), the i-th compensation scan signal CSSi_a includes a compensation period CSW_a having a high level. During the compensation period CSW_a, the compensation transistor T4_a is turned on.

Within one frame (1 frame), the ith emission control signal ECSi_a includes an emission period ECW_a having a high level. During the emission period ECW, the emission control transistor T6_a is turned on.

Within one frame (1 frame), the i-th sharing control signal SCSi_a includes a sharing period SCW_a having a high level. During the sharing period SCW_a, the sharing control transistor T3_a is turned on.

Accordingly, the pixel PXij_a including the driving circuit shown in FIG. 7 is independent of the mobility of the driving transistor T1_a and the change in the threshold voltage Vth like the pixel PXij including the driving circuit shown in FIG. 3 . Thus, the reliability of the display quality of the image (IM, see FIG. 1) displayed on the display panel (DP, see FIG. 2) can be maintained.

As described above, embodiments have been disclosed in the drawings and specifications. Although specific terms are used herein, they are only used for the purpose of describing the present invention and are not used to limit the scope of the present invention described in the claims or defining the meaning. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

DD: display device DP: display panel
PX: pixels ED: light emitting element
RN1: first reference node RN2: second reference node
ELVDD: power supply voltage RL1: first power line
DL: data lines T1 to T7: first to seventh transistors
Cst1: first capacitor Cst2: second transistor
ISS1: first initialization scan signal ISS2: second initialization scan signal
CSS: compensation scan signal SCS: shared control signal
ECS: light control signal SS: scan signal

Claims (20)

A display panel including a plurality of pixels;
One of the pixels,
a light emitting element connected to the first reference node and generating light;
a driving transistor connected between a power line receiving a power voltage and the first reference node;
a scan transistor connected between a data line receiving a data signal and the driving transistor and receiving a scan signal;
a first capacitor connected between the first reference node and the second reference node; and
A sharing transistor connected between the first reference node and the second reference node and receiving a sharing control signal;
The first capacitor and the sharing transistor are connected in series between the first reference node and the second reference node;
A control electrode of the driving transistor is connected to the second reference node. According to claim 1,
The one pixel,
and a second capacitor connected between the second reference node and a reference voltage line receiving a reference voltage. According to claim 2,
The reference voltage is a ground voltage. According to claim 2,
The driving transistor is
a first electrode connected to the power line, a second electrode connected to the first reference node, and a control electrode connected to the second reference node;
The scan transistor,
A first electrode connected to the data line, a second electrode connected to the first reference node, and a control electrode receiving the scan signal,
The sharing transistor,
A display device comprising: a first electrode connected to the first reference node, a second electrode connected to the first capacitor, and a control electrode receiving the sharing control signal. According to claim 4,
The first capacitor includes a first electrode connected to the second electrode of the sharing transistor and a second electrode connected to the second reference node;
The second capacitor,
A display device comprising a first electrode connected to the second reference node and a second electrode connected to the reference voltage line. According to claim 2,
The one pixel,
A compensation transistor connected between the driving transistor and the second reference node;
The compensation transistor,
A display device comprising: a first electrode connected to the driving transistor, a second electrode connected to the second reference node, and a control electrode receiving a compensation scan signal. According to claim 6,
The one pixel,
a first initialization transistor connected between a first initialization line receiving a first initialization voltage and the first reference node;
The first initialization transistor,
A display device comprising: a first electrode connected to the first reference node, a second electrode connected to the first initialization line, and a control electrode receiving a first initialization scan signal. According to claim 7,
The one pixel,
a second initialization transistor connected between a second initialization line receiving a second initialization voltage and the second reference node;
The second initialization transistor,
A display device comprising: a first electrode connected to the second reference node, a second electrode connected to the second initialization line, and a control electrode receiving a second initialization scan signal. According to claim 8,
Further comprising a light emission control transistor connected between the power line and the driving transistor,
The emission control transistor,
A display device comprising: a first electrode connected to the power line, a second electrode connected to the driving transistor, and a control electrode receiving a light emission control signal. According to claim 9,
The scan signal includes a scan period in which the scan transistor is turned on;
The compensation scan signal includes a compensation period for turning on the compensation transistor,
within a frame,
The display device of claim 1 , wherein the scan period and the compensation period overlap. According to claim 10,
The first initialization scan signal includes a first initialization period for turning on the first initialization transistor;
The second initialization scan signal includes a second initialization period for turning on the second initialization transistor;
Within the above frame,
The second initialization period precedes the scan period and the compensation period, and the first initialization period lags behind the scan period and the compensation period. According to claim 11,
The first initialization scan signal further includes a third initialization period for turning on the first initialization transistor;
Within the above frame,
The third initialization period precedes the scan period and the compensation period. According to claim 11,
The sharing control signal includes a sharing period for turning on the sharing transistor;
Within the above frame,
The sharing period is behind the first initialization period. According to claim 13,
The light emitting control signal includes a light emitting period for turning on the light emitting control transistor;
Within the above frame,
The display device of claim 1 , wherein the emission period lags behind the first initialization period. According to claim 14,
Within the above frame,
The display device of claim 1 , wherein the sharing period and the emission period overlap. A display panel including a plurality of pixels;
One of the pixels,
A light emitting element connected to the first reference node and generating light;
a driving transistor connected between a power line receiving a power voltage and the first reference node;
a scan transistor connected between a data line and the driving transistor and including a control electrode receiving a scan signal;
a first capacitor connected between the first reference node and the second reference node; and
A sharing transistor connected between the first reference node and the second reference node and including a control electrode receiving a sharing control signal;
The scan signal includes a scan period and a first initialization period for turning on the scan transistors, respectively;
During the scan period, a data signal is applied to the data line;
During the first initialization period, a first initialization voltage is applied to the data line;
The first capacitor and the sharing transistor are connected in series between the first reference node and the second reference node;
A control electrode of the driving transistor is connected to the second reference node. According to claim 16,
The one pixel,
A second capacitor connected between the second reference node and a reference voltage line receiving a reference voltage;
The sharing transistor,
a first electrode connected to the first reference node, a second electrode connected to the first capacitor, and the control electrode;
The first capacitor includes a first electrode connected to the second electrode of the sharing transistor and a second electrode connected to the second reference node;
The second capacitor,
A display device comprising a first electrode connected to the second reference node and a second electrode connected to the reference voltage line. According to claim 16,
The one pixel,
Further comprising a light emission control transistor connected between the power line and the driving transistor,
The emission control transistor,
a first electrode connected to the power line, a second electrode connected to the driving transistor, and a control electrode receiving a light emission control signal;
The sharing control signal includes a sharing period for turning on the sharing transistor;
The light emitting control signal includes a light emitting period for turning on the light emitting control transistor;
within a frame,
The scan period precedes the first initialization period, and the first initialization period precedes the sharing period and the emission period;
The display device of claim 1 , wherein the sharing period and the emission period overlap. According to claim 18,
The one pixel,
A compensation transistor connected between the driving transistor and the second reference node;
The compensation transistor,
A first electrode connected to the driving transistor, a second electrode connected to the second reference node, and a control electrode receiving a compensation scan signal;
The compensation scan signal includes a compensation period for turning on the compensation transistor,
Within the above frame,
The compensation period precedes the first initialization period,
The compensation period and the scan period overlap. According to claim 19,
The one pixel,
An initialization transistor connected between an initialization line receiving a second initialization voltage and the second reference node;
The initialization transistor,
a first electrode connected to the second reference node, a second electrode connected to the initialization line, and a control electrode receiving an initialization scan signal;
The initialization scan signal includes a second initialization period for turning on the initialization transistor;
Within the one frame, the second initialization period precedes the compensation period and the scan period.

Images